What was that tv show with the space boy tall curvy brown hair and he has a robot dog cartoon show?

You're likely thinking of "The Adventures of Jimmy Neutron: Boy Genius".

Here's why:

* Space boy: Jimmy Neutron is a young genius who frequently goes on space adventures.

* Tall and curvy brown hair: Jimmy has a distinctive tall, spiky brown hairstyle.

* Robot dog: Jimmy's best friend is a robot dog named Goddard.

Let me know if you have any other details that would help narrow it down!